drm/amd/display: implement DPMS DTN test v2

[why]
Existing DTN infrastructure in driver is hacky.  It uses implicit log
names, and also incorrect escape ID.

[how]
- Implement using generic DTN escape ID.
- Move file logging functionality from driver to to script; driver now outputs to string/buffer
- Move HWSS debug functionality to separate c file
- Add debug functionalty for per-block logging as CSV
- Add pretty print in python

Signed-off-by: Jun Lei <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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